When I try to use rocolatey with a Sonatype Nexus v3 feed, it does not work.

It tries to query http://<domain>/repository/<repo>/v3/query/0/?prerelease=false&q=packageid:<package>, which returns a 404 (both in Rocolatey and in browser)
If I go to http://<domain>/repository/<repo>/v3/query/0?prerelease=false&q=packageid:<package> in a browser, it works and return the expected json.

So Nexus does not like the extra slash at the end of the url path before the url query. Nuget.org works with either one.
As far as I can tell, the official API docs do not have the slash: https://learn.microsoft.com/en-us/nuget/api/search-query-service-resource